Abstract: The two 150MW steam turbine units of Sichuan Huadian Panzhihua Sanwei Power Generation Corporation Limited were put in operation at 2005. Since then, the leakage fault of high pressure heater No.2 often occurred in operation. Up to the August 2007, the blind tube rate of No.11 and No.12 units reached 8% and 9% respectively, and this influenced on the safety and economical efficiency of the units badly. According to the fabrication, erection, debugging and actual operation of No.2 high pressure heater, the reason of leakage of No.2 high pressure heater was analyzed, and relevant solving measures were proposed. After effective rectification, the operation rate of No.11 and No.12 high pressure heaters were raised from previous 79.62% and 81.98% to present 99.32% and 98.43%, the safety and economical efficiency of the unit operation were raised.

Key words: 150MW steam turbine unit, high pressure heater, leakage, operation rate